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Estimation

# Estimation - Estimation and Sampling Distributions Bring...

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Unformatted text preview: Estimation and Sampling Distributions Bring the textbook to class . Inferential Statistics : The Big Picture • Social scientists: – want to know about the characteristics of populations – but usually can only measure samples • Therefore they need to estimate population parameters from sample statistics • Two goals – Make unbiased estimates – Assess error made when making estimates • A concept known as a sampling distribution helps accomplish these goals Problem • We typically want to know something about people in general but it is seldom practical to involve a whole population in a research study • The scores we typically work with are from a sample of the larger population • Partial solutions – try to obtain a sample that is representative of the population – use sample statistics to estimate population parameters Sampling • Goal -- obtain a subset of the population that represents the population – with similar characteristics -- e.g, mean and standard deviation • Ideally we should use random sampling – each element in the population has an equal chance of being chosen – each selection is independent of other selections...
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Estimation - Estimation and Sampling Distributions Bring...

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